Process of dyeing raw silk



UNITED STATES PATENT OFFICE.

EUGENE L. MAUPAI, OF NEW YORK, N. Y.

PROCESS OF DYEING RAW SILK.

No Drawing.

To all whom it may concern:

Be it known that I, EUGENE L. MAUPAI, a citizen of the United States of America, residing at New York city, county and State of New York, have invented certain new and useful Improvements in Processes of Dyeing Raw Silk, of which the following is a full,- clear, and exact description.

This invention relates to an improvement in the process of treating and dyeing raw silk, the object being to provide a process whereby certain elements, such as metallic salts, are used to harden the cereceous matter or fatty substances contained in grege silk, so as to render the same in condition whereby the silk will be resistant to the action of strong alkali or acid solutions, thus putting the silk in such condition as to readily allow the same to be dyed with vat colors, such as indanthrine, algol, helindone or the like. So far as I am aware, it has heretofore been impossible to dye grege silk with such colors, because of the high percentage of alkali present in the dye.

In carrying out my invention, I proceed as follows:

I first saturate the silk with a metallic salt, diluted in water, such'for instance as chrome chlorid, iron liquor or alum, thus producing an'insulation or hardening of the fatty matters or cereceous substances contained in and around the silk threads.

Specification of Letters Patent.

Application filed June 14,

Patented Sept. 7, 1920. 1920. Serial No. 388,811.

Thereupon the silk is washed and then dyed in the usual manner with vat colors, whereupon the silk is Woven into fabric. The fabric is then washed in a soap or alkali solution, such as is used in degumming silk.

What I claim and desire to secure by Letters Patent is 1. The process of treating and dyeing grege silk, which consists in first hardening the silk threads with a metallic salt, thereupon washing the silk, and then dyeing the same with vat colors;

2. The process of treating and dyeing grege silk, which consists in first hardening the silk threads with a metallic salt, thereupon washing the silk, then dyeing the same with vat colors, weaving the silk into a fabric and thereupon degumming the silk fabric. 2

3. The process of treating and dyeing raw silk, which consists in-saturating the silk with a metallic salt to produce a hardening of the cereceous substances contained in the silk, then washing the silk, then dyeing the silk with "at colors, and thereupon degumming the dyed silk.

Signed at New York city, N. Y., this 11th (lay of June,-1920.

EUGENE L. MAUPAI. Witnesses MAURICE BLOCK, EDWARD A. JARVIS. 

